Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2185cff6b51be1…

MALICIOUS

PDF

33.6 KB Created: 2020-10-12 01:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c35ed7b2b3e34dc7225b20ae0969d734 SHA-1: 73c7e8de7c7e58ba6b6f737b306ec39203c4b540 SHA-256: fa2185cff6b51be1f7e35566e31728376bfbe16bf835718b4929f21e63f301f8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to 'https://ggtraff.ru/strik?keyword=ipevo+Cusi+coj%25C3%25ADn+stand'. Additional heuristics indicate this is a link farm hosted on disposable infrastructure, designed to lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=ipevo+Cusi+coj%25C3%25ADn+stand In PDF document text
    • https://site-1048481.mozfiles.com/files/1048481/lufepisopu.pdfIn PDF document text
    • https://site-1036829.mozfiles.com/files/1036829/bidovofa.pdfIn PDF document text
    • https://site-1039197.mozfiles.com/files/1039197/baxajibiko.pdfIn PDF document text
    • https://site-1042345.mozfiles.com/files/1042345/golowaveloxiresebu.pdfIn PDF document text
    • https://site-1040360.mozfiles.com/files/1040360/16604239452.pdfIn PDF document text
    • http://xigibuso.codyjwoods.com/uploads/1/3/1/3/131384609/1496660.pdfIn PDF document text
    • http://katedusos.aroundbend.com/uploads/1/3/2/6/132682006/vofox_lomarotozu_lawupetudanete_novonadak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf200d0-8e1a-41e1-b995-3a17da3f86fb/fudukowanejuvotakis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8182cc-4d8d-41f6-8b3c-49392be1cd53/43699316261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6f00c4-01b1-465b-80b1-c0a4759945d3/mojilaxuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373bf22d-999f-4c5f-af77-6b523552c429/98262664843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e5b5d7-319c-432b-84d3-85e2c047ff39/bovixodeniwipuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26a1428-ffe0-4ef4-8ec7-4e47d349540a/17733230553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498c87dc-d229-4cfe-b56c-13e695842f1a/28901053537.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45D0 5068 bytes
SHA-256: 0ffde4a678aa8c7e370a7e32a9ade027b28a70883415701ed43cd4faffbf5f7c
font_01_sfnt_off00005731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5731 9824 bytes
SHA-256: 1ecd5c03bce2aedd10c3b15354eb45e45edf489318588d0a15eb0808b0c3f57c

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